The BMW X1 offers two primary brake options: the standard braking system and the optional M Sport braking package. The better brake system for the BMW X1 is the M Sport braking package. This package includes larger brake rotors and calipers, which provide superior stopping power and heat dissipation compared to the standard brakes.

According to a study by Car and Driver, the M Sport braking package features 13.8-inch ventilated rotors and six-piston calipers at the front, and 12.6-inch solid rotors with single-piston calipers at the rear. These components are designed to handle the increased performance and weight of the M Sport package, which includes a sport-tuned suspension and more powerful engine options.

The larger rotors and calipers in the M Sport package offer several advantages. Firstly, the increased surface area of the rotors allows for more efficient heat dissipation, reducing the risk of brake fade during high-performance driving. Secondly, the six-piston calipers at the front provide a stronger clamp force, which translates to shorter stopping distances. According to BMW, the M Sport braking package offers a 0.1-g improvement in braking performance compared to the standard brakes.

Additionally, the M Sport braking package features a unique design that complements the aggressive aesthetics of the M Sport package. The black calipers and polished rotors add a visual appeal that is often sought after by BMW enthusiasts.

In conclusion, the M Sport braking package is the better option for the BMW X1 due to its superior stopping power, heat dissipation, and aesthetic appeal. The data from Car and Driver and BMW's own specifications support this claim, making the M Sport braking package the preferred choice for those seeking enhanced braking performance in their BMW X1.